Clement felton



(man c. FBLTON.

LATCH.

No. 431,843. Patented July 8, 1890.

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fyfmzd. /bJM/ UNITED STATES PATENT OEEICE.

CLEMENT FELTON, OF TORONTO, CANADA.

LATCH.

SPECIFICATION forming part of Letters Patent No. 431,843, dated July 8,1890.

Application filed October 4,1889. Serial No. 326,038. (Model.)

To all whom it may concern:

Be it known that I, CLEMENT FELTON,locksmith, ofthe city of Toronto, inthe county of York,in the Province of Ontario, Canada, have invented acertain new and useful Improvement in Latch-Locks, of which thefollowing is a specification.

The object of the invention is to design a latch -lock which willinstantly and automatically lock itself upon being brought in contactwith its catch, and which, when locked, will be practically impossibleto open until pressure is exerted against the door-knob; and itconsists, essentially, of a bolt having a friction-roller j ournaled onits end and arranged in connection with simple mechanism contained inthe lock-case, which mechanism is designed to cause the bolt to projectout ot' its case the instant the door is closed and the lock comes incontact with the catch, which has a beveled recess formed on its face toreceive the proj ecting end of the bolt, which at this time is held sothat it cannot be pushed back until the door-knob is pressed upon.

Figure l is a view of my improved lock with one of the sides of the caseremoved to expose the interior construction of the mechanism. Fig. 2 isa perspective detail of the catch used in connection with my lock.

1n the drawings, A represents the bolt, which has a friction-roller B journaled on its end, as indicated. A curved nger C is fixed to andprojects from the bolt A, and a curved finger D is pivoted immediatelybelow the bolt A, and is provided with a spring E, applied to it in sucha manner as to hold the end of the curved linger D against the curvedfinger O. The heel of the curved nger D projects behind the block F,which is movably held in the lock-case and has a pin G connected to it,which projects through the face of the lock slightly on one side of thepoint Where the bolt A projects through.

H is a quadrant pivoted at a in the lockcase and actuated by a spring Iin the direction indicated by arrow. The said quadrant is also connectedby a pin and slotted hole to the bolt A. Ratchet-teeth b are formed onthe quadrant H, and a ratchet-pawl J, pivoted in the lock-case, isarranged to engage with the ratchet-teeth l).

A pivoted bell-crank lever K is located as indicated, one of its armsprojecting behind the tail of the ratchet-pawl J, while its other armprojects over a spring-plate L, the tension of which is designed to holdthe lever K clear` of the tail of the ratchet-pawl J. A spindle M passesthrough and is shouldered upon the arm of the lever K, which rests onthe spring-plate L, through which the said spindle also passes. Oneither end of the spindle M an ordinary door-knob is fixed.

YHaving now described the mechanism involved in my invention, I shallproceed to explain its operation, and to do this must first drawattention to the catch-plate N, which is secured to the face of thedoor-jamb, so that the Wedge-shaped recess d made in it shall beopposite to the end of the bolt A and the Wedge-shaped recess e oppositeto the pin G when the door is closed.

In the normal position of the lock the friction-roller B on the end ofthe bolt is substantially flush with the face of the lock, while the pinG projects beyond the said face. Vhen the door is closed, the pin Gcornes in contact with the wedge-shaped recess g. As it ascends the saidWedge is forced back, and, acting against the heel of the curved fingerD., raises the end of the said finger clear of the finger C, when by theaction of the spring I the bolt A is immediately shot out, beingsimultaneously opposite to the wedge-shaped recess d, which, it will beobserved, is slanted in the opposite direction to the Wedge-shapedrecess d. The ratchet-pawl J drops into the ratchet-teeth Z), formed inthe quadrant H, and efteetually locks the said quadrant, so that thebolt A cannot be pushed in until the pawl J is raised clear of theratchet-teeth. Consequently so long as the pawl remains in contact Withthe ratchet-teeth h the door cannot be pushed open, as the end of thebolt A cannot ascend the incline of the wedge d.

From this description it will be seen that the moment the door closes itis instantly and automatically locked. In order to open the door,pressure is directed on the end of the spindle M, `'so as to compressthe spring-plate IOO L. The bell-crank lever K being simultaneouslypushed down, its arm, which is behind the tail of the ratchet-pawl 5l,presses the said ratchet-pawl, causing it to tilt on its pivot and raiseit out of contact with the ratchet-teeth b, thus releasing the bolt andpermitting it to be pushed back to clear itself of the catch-plate N,and resetting the mechanism is the lock-case ready for the nextoperation.

What I claim as my invention isl. A bolt A, arranged longitudinallymovable in a lock-case and having a curved iinger C connected to it, incombination With the curved finger D, block F, and pin G, arrangedsubstantially as and for the purpose specified.

2. A bolt A, arranged longitudinally movable in a lock-case andconnected to the pivoted quadrant H, having ratchet teeth b formed onit, in combination with the ratchetpawl J, bell-crank lever K, andspring-plate L, substantially as and for the purpose specified.

3. A bolt A, with a friction-roller B journaled on its end and arrangedlongitudinally movable in a lock-case and connected to the pivotedquadrant H, having ratchet-teeth l) formed on it, in combination withthe ratchetpaWl J, bell-crank lever K, spring-plate L, andlongitudinally-movable spindle M, substantially as and for the purposespecified.

4. A bolt A, with a friction-roller B journaled on its end and arrangedlongitudinally movable in a lock-case and having a curved finger Cconnected to it and arranged to operate in conjunction With the curvedfinger D, block F, pin Gr, and'spring E, in combinashaped recesses d ande, formed in the catchplate N, substantially as and for the purposespecified.

Toronto, August 6, 1889.

CLEMENT FELTON.

In presence olf- CHARLES C. BALDWIN, W. G. MCMILLAN.

